Provide the full names for the following abbreviations:
$(1)$ $RuBP$
$(2)$ $PGAL$

The first stable intermediate product of photosynthesis is ......... .

$A-$ RuBisCO,which is the most abundant enzyme in the world,is characterized by the fact that its active site can bind to both $CO_2$ and $O_2$.
$R-$ RuBisCO is the most abundant enzyme in the world.

When a $CO_2$ molecule enters the Calvin cycle,how many molecules of $ATP$ and $NADPH$ are required,respectively?

Which one of the following is the product of the dark reaction of photosynthesis?

$C_3$ cycle (reductive pentose phosphate cycle) is basically a